McIntosh was a regular makeup artist on Buffy the Vampire Slayer between 1997 and 2002. He has also worked on shows like Pushing Daisies and Life. Other work in the film realm included Memoirs of a Geisha, both City Slickers films, and the comic adaptation Masters of the Universe (1987, with Michael Westmore, June Westmore, and Gerald Quist).

In 2011, McIntosh served as makeup department head for Torchwood: Miracle Day, the fourth series of the Doctor Who spin-off Torchwood.